Body of rector found in wood (6)
I believe the answer is:
corpse
'body' is the definition.
(corpse is a kind of body)
'rector found in wood' is the wordplay.
'rector' becomes 'r'.
'found in' means one lot of letters goes inside another.
'wood' becomes 'copse' (I've seen this before).
'r' going into 'copse' is 'CORPSE'.
'of' acts as a link.
(Other definitions for corpse that I've seen before include "Cadaver, dead person" , "Dead bodies" , "Roof beam" , "Dead body" .)